How to use the ionic-native.AppVersion.getPackageName function in ionic-native

ready() {

    console.log('Device from app: ', Device);

    this.version = Device.version;
    this.deviceModel = Device.model;
    this.dplatform = Device.platform;

    AppVersion.getVersionNumber().then((value) => {
      this.appVersion = value;
      console.log(value);
    }, (error) => {
      console.error(error);
    })

    AppVersion.getPackageName().then((value) => {
      this.appPackageName = value;
      console.log(value);
    }, (error) => {
      console.error(error);
    })

    AppVersion.getAppName().then((value) => {
      this.appName = value;
      console.log(value);
    }, (error) => {
      console.error(error);
    })

    AppVersion.getVersionCode().then((value) => {
      this.appVersionCode = value;
      console.log(value);

this.updateOutput('Error getting version number.', true);
                return;
            }
            if(_resolved_count<4 && _called_count <4) return;
            this.updateOutput("App name: " + name + "" +
                "<br>Package name: " + package_name + "" +
                "<br>App Version: " + version_number + "" +
                "<br>Version Code: " + version_code);
        }
        AppVersion.getAppName().then((data) =&gt; {
            _resolved_count++;
            name = data;
            output();
        }, ()=&gt;output());

        AppVersion.getPackageName().then((data) =&gt; {
            _resolved_count++;
            package_name = data;
            output();
        }, ()=&gt;output());

        AppVersion.getVersionNumber().then(data=&gt;{
            _resolved_count++;
            version_number = data;
            output();
        }, ()=&gt;output());

        AppVersion.getVersionCode().then(data=&gt;{
            _resolved_count++;
            version_code = data;
            output();
        }, ()=&gt;output());